On bitopological separation axioms
On Blumberg type spaces
On Borel Classes of Sets of Fréchet Subdifferentiability
We study possible Borel classes of sets of Fréchet subdifferentiability of continuous functions on reflexive spaces.
On Borel measurability of orbits
On Borel properties of semi-continuous multifunctions
On Borel-measurable collections of countable-dimensional sets
On boundaries of parallelizable regions of flows of free mappings.
On boundedness in uniform spaces
On bouquets
On butterfly-points in , Tychonoff products and weak Lindelöf numbers
Let be the Tychonoff product of -many Tychonoff non-single point spaces . Let be a point in the closure of some whose weak Lindelöf number is strictly less than the cofinality of . Then we show that is not normal. Under some additional assumptions, is a butterfly-point in . In particular, this is true if either or and is infinite and not countably cofinal.
On Carathéodory type multifunctions
On Carathéodory type selections
On cardinal invariants
On cardinalities of row spaces of Boolean matrices.
On Caristi's fixed point theorem in F-type topological spaces.
On Cartesian factors and the topological classification of linear metric spaces
On categories of supertopological spaces
On category-raising and dimension-raising open mappings with discrete fibers
On c-closed functions
On c-continuous fundamental groups